Another metal you'll want to work into your regimen: Copper. Why? This ingredient stimulates elastin—the cross-hatched fibers that give skin its structure. Translation: The more elastin you have, the less fine lines and wrinkles you'll see. Plus, copper serves as an antioxidant, which helps protect the skin from oxidative stress and improves the skin's barrier. Test out its ability by applying Kiehl's Powerful Wrinkle Reducing Cream with Copper PCA and Abyssine, $52, kiehls.com, daily.